A spin off the world faf, which means fuck ass fail. Used to describe people who are terrible at doing something, or people who are just plain stupid. Like, you shun them, stupid. FAF can also mean fat as fuck, or fat ass fool.

Sounds like the word buffalo.

When you hear the song buffalo soldier by Bob Marley, you can sing the words as
"Faffalo (_insert name here_), fuck ass failure, faffalo (name), is the (queen/king) of the faffalos."

"OMG that girl Yagzel thinks she's got the stuff since she's a lesbian anorexic. She's such a faffalo!"